20009575 has 12 divisors (see below), whose sum is σ = 25163568. Its totient is φ = 15780800.

The previous prime is 20009569. The next prime is 20009581. The reversal of 20009575 is 57590002.

It is an interprime number because it is at equal distance from previous prime (20009569) and next prime (20009581).

It is not a de Polignac number, because 20009575 - 2⁵ = 20009543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3862 + ... + 7411.

It is an arithmetic number, because the mean of its divisors is an integer number (2096964).

Almost surely, 2^20009575 is an apocalyptic number.

20009575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20009575 is a deficient number, since it is larger than the sum of its proper divisors (5153993).

20009575 is a wasteful number, since it uses less digits than its factorization.

20009575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11354 (or 11349 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 20009575 is about 4473.2063444469. The cubic root of 20009575 is about 271.4850723297.

Adding to 20009575 its reverse (57590002), we get a palindrome (77599577).

The spelling of 20009575 in words is "twenty million, nine thousand, five hundred seventy-five".